Remote Keyless Entry / Remote Start (RKE)

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A driver pressing a button on the key fob sends an RF message to lock or unlock the car. This RF link must be reliable and have good noise immunity. The key fob transmitter must comply with local regulations. It should have security implemented by a rolling code and AES encryption. It should use very little current to give long battery life. The RF link might have a fixed frequency or be multi-channel. The link can be one-way from the fob to the car, or a bi-directional two-way exchange.